How are the switches in a spine-and-leaf topology interconnected?

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How are the switches in a spine-and-leaf topology interconnected?
A . Each leaf switch is connected to one of the spine switches.
B. Each leaf switch is connected to two spine switches, making a loop.
C. Each leaf switch is connected to each spine switch.
D. Each leaf switch is connected to a central leaf switch, then uplinked to a core spine switch.

Answer: B